氢基矿相转化对铌铁矿浮选行为的影响

采用氢基矿相转化技术可实现白云鄂博中贫氧化矿中铁矿物的高效回收,但对于铌矿物如铌铁矿在氢基矿相转化过程中可浮性的变化还尚未探清。通过单矿物浮选试验,并结合X射线衍射(XRD)、比表面积法(BET)、红外光谱(FTIR)、接触角等分析测试手段,研究氢基矿相转化对铌铁矿可浮性的影响规律,结果表明,氢基矿相转化前铌铁矿在最佳条件(pH = 7、Pb(NO3)2 = 100 mg/L 、BHA = 150 mg/L 、MIBC = 60 mg/L)下,浮选回收率可达92.00%;氢基矿相转化后铌铁矿在最佳条件(pH = 8、Pb(NO3)2 = 100 mg/L 、BHA = 360 mg/L 、MIBC = 60 mg/L)下,浮选回收率可达89.23%,表明氢基矿相转化降低了铌铁矿的可浮性。在氢基矿相转化过程中,铌铁矿表面会产生大量裂隙和孔洞,使其比表面积增大,导致其在浮选过程中会消耗大量药剂。铌铁矿氢基矿相转化前后均与苯甲羟肟酸发生化学吸附。     

基于Res-UNet算法的螺旋溜槽精矿带识别分割方法研究

螺旋溜槽在铁、锡、钛、钽铌等金属及硫、煤等非金属矿的选矿生产中获大量应用,但目前螺旋溜槽的精矿截取调节控制还是依赖于人工,急需开发一种精矿的自适应截取技术代替人工截取以提高螺旋溜槽的生产效率。而实现这一目标的首要任务就是需要解决依赖人工肉眼获取精矿带位置信息的问题,因此提出了一个改进的UNet网络模型Res50-UNet-FD。算法模型使用UNet模型为基础,将残差网络ResNet50代替UNet网络中编码部分的特征提取网络,解决了深层特征提取过程中特征梯度消失以及网络消失的问题,有效提升了螺旋溜槽精矿带特征信息提取的精度。同时,为了改进和优化螺旋溜槽精矿带图像样本数据难易不平衡的问题,利用Focal Loss和Dice Loss的混合损失函数代替原本的CELoss损失函数。经对比,本文算法优于VGG-UNet、Res34-UNet、DC-UNet网络模型,算法模型的mIOU、mPA、F1分数和精确度分别为0.963 2、0.986 9、0.987 0、0.990 7。在性能指标上,本文算法无论是mIOU、mPA还是F1分数,整体性能都比VGG-UNet、Res34-UNet、DC-U...     

基于期权的矿产资源采矿权估价单因素模型

矿产资源采矿权可以被认为是一个多期多阶段的复合看涨期权,在基于期权的采矿权价值形成机理研究基础上,假定无采矿权交易成本、不考虑关闭和开启矿山时的成本和矿山的永久性废弃以及利率为无风险利率,研究了矿产资源储量价值随机波动下的基于期权的矿产资源采矿权估价单因素模型,并结合一煤炭资源实例对比了收益现值法与单因素模型,发现期权估价方法较收益现值法能提高矿产资源采矿权价值。     

Minerals in vitro bioaccessibility and changes in textural and structural characteristics of uncooked pre-germinated brown rice influenced by ultra-high pressure

Ultra-high pressure (UHP) is considered as an effective processing method to enhance micronutrients utilization efficiency in germinated brown rice (GBR), but there is little information available for the effects of UHP treatments on mineral bioaccessibility and related structural characteristics. Therefore, this work examined the changes induced by UHP in the in vitro bioaccessibility of selected minerals and structural and textural properties at pressures, as well as their potential relationship. UHP treatments were applied at 100, 300 and 500 MPa for 10 min, and 0.1 MPa as control. Proximate analysis showed that free fatty acids (FFA) and moisture in GBR greatly increased after UHP treatment. Three representative minerals with different levels were chosen to assess the bioaccessibility, including phosphorus (P), magnesium (Mg) and manganese (Mn). The results demonstrated that the minerals bioaccessibility, measured by percentage solubility, were the highest when at 300 MPa whereas it decreased at 500 MPa. Correspondingly, microstructure imaging by scanning electron microscope (SEM) showed that the gelatinization of starch granule occurred at 300 MPa and it became more obvious when increased to 500 MPa. Starch gelatinization significantly lowered the hardness of GBR grains, simultaneously accompanied with the decrease of cohesiveness, gumminess and resilience through texture profile analysis (TPA). Multivariate analysis by principal component analysis and canonical correspondence analysis indicated a highly intra-associated (p < 0.01) TPA parameters and a close correlation between the bioaccessibility and hardness, chewiness and springiness. These results provide information on minerals bioaccessibility and structural properties of uncooked GBR after UHP treatment, which could lay the foundation for further elucidating the correlation between structure and micronutrients bioaccessibility.     

Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China

The Lower Cretaceous Xiagou Formation contains the major source rocks for the crude oils discovered in the Qingxi Sag and the South Uplift in the Jiuquan Basin, northwestern China. The Xiagou Formation source rock was formed in a closed, anoxic, reducing, alkaline lacustrine environment with a high salinity. Its high content of brittle minerals is favorable for the fracturing of reservoirs in source rock formations in the Qingxi Sag. The Xiagou Formation contains a great number of fair to excellent source rocks, and their organic matter (OM) came chiefly from plankton/algae and high plants as well as possibly bacterial organisms. The Xiagou Formation source rocks mainly contain Type II OM and some Type III and Type I OM, with good oil-generating potential. The source rock maturity is mainly in the early-mature and mature stages, and its R_o value corresponding to oil peak is about 0.8%, which is lower than classic oil peak Ro value of 1.0%; therefore, a great deal of hydrocarbon was generated before the classic oil peak R_o = 1.0%. Mature source rock in the Xiagou Formation tends to be distributed in the older members and at a greater depth. There is a better exploration potential of tight oil in the deep Qingxi Sag.     

以矿石质量控制为目标的卡车调度系统控制理论模型

本文应用最优控制的理论建立了以矿石质量控制为目标的卡车调度系统的数学模型。并求出了某实例的数值解,对解的分析说明控制理论模型比以往的方法有本质的进步。     

人工矿床的研究——以大冶铜绿山为例

本文通过铜绿山铜铁矿尾矿的综合利用及物质组分研究 ,以期对尾矿的综合利用及尾矿污染的防治与对策提供可靠的理论及实验依据。物质组分研究结果表明 ,该尾矿的主要铜矿物为黄铁矿和戴氏赤铜矿等 ;主要的铁矿物是赤铁矿、褐铁矿及磁铁矿等 ;另外含有极少量的闪锌矿等。尾矿中铜和铁的含量分别是 0 .65%和 2 5.61 % ,即全部尾矿中蕴藏有 7.2万 t铜和 30 0万 t铁 ,这相当于一座中型铜矿和一座中型铁矿 ,同时尾矿中还蕴藏有相当的 Au、Ag、Mn、Co、Re等有益元素 ,综合利用前景十分广阔。     

鞍山地区铁矿石选矿厂技术改造的探讨

介绍了鞍山地区铁矿选矿厂的现状及其与国外先进水平的差距,并对其 改造及发展提出了建议。     

矿物磨料微粉体比表面积微机化计算与粒度仪配套应用研究

矿物磨料微粉体的比表面积大小,关系到矿物表面改性及活性,影响着非金属矿产品开发和利用。研究比表面积与诸多因素的关系,提高了矿物磨料微粉体比表面积计算的精确度,通过智能化的计算过程,结合粒度测试仪器酸套使用,为磨料微粉体比表面积的测试提供了新的高精度的测试方法。     

低渗透率地层渗透率的确定方法

结合大庆油田外围低渗透率地层的地质特点,根椐渗流理论和岩心分析资料,分析了地层渗透率与孔隙度、组成地层的各种矿物含量以及泥质含量之间的关系,建立了不同矿物组合地层的渗透率计算方程。用本方法计算的和岩心分析的渗透率进行了对比,二者之间具有较好的一致性。